Bit-brace.



S. N. HALL.

BIT BRAGB.

Patented Aug. 18, 1914.

PPLIOATION FILED NOV.17, 1913.

IN VEN TOI? 1HE NoRRls PETERS co.. PHoro-LITHD.. WASHINGTON. Duc.

v andwhich may bey readily adjusted on they UNITED STATES PATENT onirica. a

sAMuEL nfHALI.,A or HOUSTON, TEXAS.

, BIT-BRACE.

T0 all whom t may concern:

Be `it known that I, SAMUEL citizen of the-j United States, residinr at Houston, in the count Y of Harris and tate of. Texas, have invented certain new and useful Improvements Bit Braces, of which the following is aspecification,

This invention relates to new and useful improvements in bit braces. j

The object of the invention is to provide a brace of the character described, adapted to be used in the ordinary manner and also equipped with a crank arm which is secured to the bit chuck and which has an adjustable handle, whereby said chuck may be rotated while the brace remains stationary. Incase a bit of small size is used, it is'often desirable to rotate the same rapidlyand small leverage is required to rotate the same and in such case the handle ofthe crank arm may be adjusted so as to bring the same close to the chuck `*and a more rapid-rotation of the bit can thus beaccomplished.

A further feature of the invention resides in the provision of an improved form of handle,- which is carriedl by the crank arm stock-of the brace and used as a` handle `therefor when the brace is used in the ordinary manner.

Another feature ofthe invention resides in the provision of a grip, whereby the brace stock may be held-in steady position'while the bit is being rotated by means of the adjustable crank arm.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, opera` tion and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings, wherein. v y y v Figure 1 is a side elevation of the `complete device, shown partially in section. Fig. 2 shows a side elevationof the adjustable handle of the crank arm. Fig. 3 shows an end viewy thereof. Fig. 4 shows a plan view of the crankv arm and adjustable handle. Fig. 5 shows a plan view of t-he crank arm handle. Fig. 6 shows anend view thereof, and Fig. 7 shows a plan view of the crank arm, partially in section, showing the method of its attachment to the chuck.

Referring now more particularly to the drawings, wherein like numerals of referencedesignate similar parts in each of the v l Specification of Letters-Patent. i

Application filed November 17, 1913.

N. HALL,

' Patented Aug. 18, semina. 801,559. f

figures', the numeral 1 refers to the stock vof the brace, which, in lgeneral'contour, isofthe usual and well knownform.VV One end of this stock has the breast piece 2 which is rotatable relative to the stock and the otherV end of the stock carries the bearing member l 3 in which the chuck 4L rotates. The outer end of this chuck is arranged to receive the bitl .5 and is of the usual'and well knowncon` struction, andthe inner end thereofV` is re` theratchet wheel S, the purpose of which will be hereinafter set forth. This crank yarm is a tubular member of the desired length andits free end carries a handle supporting member 9 which may be adjusted on said arm, as lwill be hereinafter described, so as to adjust the position of lthe handle relative `to .the chuck. Vhen va small bit is being'used and it is desired to rotate the same rapidly, the handle may be adjusted on the arm 6, so as to bring it close to the chuck, as shown indotted lines in Fig. 1, but when. a large bitis in use, and itis vnecessary Ito rotatevthesame slowly, said" handle may be adjusted so as to give more leverage, or it may be brought into the position shown by heavy'lines in Fig. v1,'and the device thus used intliemanner of the ordinary brace,

said crank arm handle acting as a handle for the brace, being specially constructed for that purpose, whichV special construction `will now be described.

One end of the crank varm 6,V as hereinbefore explained, has the handle supporting ineniber, which is semi-tubularin shape, heilig deeply grooved from end vto end. This member serves as a support for the handle 10. This handle is formed in two sections, as shown in Figs. 5 and 6, said sections being hinged together at one side my means of the hinges 11 and 12, so that the handle may be readily opened and passed over the handle supporting member 9 and the stock 1 of the brace, as shown 4in Fig. 1 and when in this position, said stock will rest in the groove of the member 9. The hinge 12 has a coil spring 13 which surrounds the pintle of said hinge and whosefree ends projects out each way and press against the sides of said hinge duced and vprojects through the bearing 3,

` tapped hole in one side of the bearing member 14 and its inner end is adapted to project against said arm, and by means of this screw, the handle may be lined in any desired. position on the crank arm.

Arrangedbetween the fingers 7, on each side are two dogs 16 and 17, which are pivoted to said fingers and extending across the bottom of said slot 'between the lingers is an oblong piate 18, which rests against the inner end of said dogs. The end of the arm 6V has an internal socket 19 alined with the slot between the fingers in which is seated a coil spring Q0, which presses against the plate 18 and which surrounds a stud 21 depending from the central portion of the plate 18. The pressure of said spring holds the plate 18 against the inner ends of the dogs 16 and 17 and operates to hold said dogs in engagement with the ratchet wheel 8, one on each side, said dogs serving to lock the chuck 4: against rotation relative to the arm 6. In use, the brace must often be held in such a position that a complete rotation of the crank arm 6 is impossible and the hole must be bored by successive partial rotations oi the bit. 1n such cases, one of the dogs, as 16, is withdrawn, so that when the crank arm is given a partial turn iii one direction, the chuck and bit will also be turned, but as brought back to its original position, the chuck will remain stationary, the dog 17 slipping over the teeth of the ratchet wheel 8, and engaging therewith only when another forward turn is imparted to the crank arm.

The invention presents a simple, etlicient and economical bit brace whereby the speed of rotation, or leverage, of the chuck may be easily increased or decreased to suit the work `to be performed; it being pointed out that the manipulating handle and its sleeve may be entirely removed from and reversed upon the crank arm to further reduce the leverage as will be readily appreciated.

`What l claim is 1. The combination with a bit stock having a chuck Whose inner end projects beyond its bearing in the stock, of a member secured to the projecting end oi' said chuck, and radially adjustable means carried by said member for rotating said chuck independently of said stock.

2. The combination, vvitha bit stock having a chuck, of a member, having an independent operative connection with said chuck, and means carried by and adapted for reversal upon said member, said meinber being so formed that it affords dierent degrees ol' leverage by such reversal, for rotatingy said chuck independently of ysaid stock. Y

3. The combination, with a bit stock having a chuck, the inner end of which projects beyond its bearing in the stock, of a member secured to the projecting end of said chuck, and radially ustable means carried by said member for rotating said chuck independently oi said stock and reversible thereon to further vary the leverage. Y

l. The combination with a bit stock having a chuck, of an arm having an operative sinapsi, n. nains.

Witnesses G. WV. JOHNSON, E. E. Fimiviis.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, 1D. C. 

